Refrigerator door



May 19, 1925.

L. G. CO PEMAN REFRIGERATOR DOOR 2 Sheets-Sheet 1 Filed Dec. 20. @923 1 Sum: r l r May 19, 1925.

L. G. COPEMAN REFRIGERATOR DOOR Filed Dec. 20 1923 2 Sheets-Sheet 2 I Fig. 9.

Patented May 19, 1925.

UNITED "STATES- PATENT OFFICE.

LLOYD G. COPEMAN, OF FLINT, MICHIGAN.

nnrnrennagroa noon.

Application filed December 20, 1923.- Serial 'No. 681,901.

To all whom it may concern:

Be it known that LLOYD G. COPEMAN,

a citizen of the United States, residing at Flint, in the-county of Genesee and State of Michigan, has invented certain new and useful Improvements in Refrigerator Doors,-

of which the following is a specification. I This invention relates to a cast refrigerator door. The object of the present invention is to cast a tile door lining directly on a fibrous outer panel which provides a cheaper and lighter construction, the door having a dead air space in the interior which serves as a heat insulator. i

Another object is to providea'mechanicalunion between the cast part of the door and the fibrous outer panel that isvnot readily broken. In fact, the tile and the outer panel are so secured andkeyed together that it requires considerable effort to force. the

same apart. Anotherpurpose of a door oflining of the door onto an outer panel which is of different material. It is possible tohave an outer panel formed of a, material of less heat conductivity for the purpose of insuring proper insulation to the-interior of the refrigerator.

In the drawings: I I Figs. 1 to 7 inclusive are views in section showing the steps in manufacturing the door.

Fig. 8 is a section on the line 8 -8 of Fig. 7.

Fig. 9 is a detail in perspectiveof the re in'forcing member. I

Fig. 10 is asection on the line 10.-'10 of Fig. 11 is a detail of-the blank' which forms the core. I I

Fig. 12 is a detail in perspective of one corner of the core.

Fig. 13' is a section on the line 13 13 of Fig. 12.

Referring to Figs. 1 to 7 inclusive, I have shown the successive steps in the manufacture. The first step is the placing of an inverted box-like core a on a ,fibrous outer panel 7) (refer to Fig. 11). Thiscore is formed from a blank of fibrous material or a fibre board, and comprises the main body blank 0, the end flaps d and the side flaps c. Theend and side flaps are folded along the dotted lines f, the flaps again folded along the dotted lines 9 to form the flanges h which are adapted to rest upon the fibrous outer panel. The sealing strips 2' are secured to the core at the corners whenthe 'blank is folded so as to seal the joints.' After 'thi's-box-like core has been placed in position on the outer panel I), the same is preferably painted or coated with a layer ofsilicatebf'soda,-designated This additionally seals all the joints and provides practically an air tight box.:

The reinforcing frame 70 is provided with the flanges m and when the reinforcing frame is superimposed over the core, the sides of said reinforcing frame will be spaced a slight distance from the sides of the core.

This reinforcing frame has a series of holes n punched out .in the side, for a purpose that will be hereinafter described. The

flange m superimposed on the flange h of the core is then nailed or secured by screws to the fibrous outer panel asat 0, thus securingtogether the outer panel I), the core a and the reinforcing frame 70.

this outer panel and core, and in Fig. 6 the casting material has been poured into the die. However, the cement may be forced in under pressure. -I prefer to use a casting material which is known as oxy-chloride cement, which I find well adapted to doors of this character. poured cold and the same will flow into the die and around thereinforcing member, the cement flowing through the holes a carried by the reinforcing member and into the space between the reinforcing member and the core. In this way the reinforcing frame is keyed to the cast inner lining or tile and as the reinforcing frame is mechanically secured to the outer panel, obviously, the inner lining and the outer panel will be mechanically united.

In addition to the mechanical union of the reinforcin member and the outer panel, the cement additionally possesses properties similar to glue and where the cement contacts with the fibrous outer panel, the same will adhere to the fibrous material of the panel. The cement will also penetrate the pores of the fibrous panel thus insuring a firm union. When pressure is used for casting the lining,

the cement will be forced into the pores Fig. 5 shows the die 71 superimposed over- This casting material is' there is formed a finished product having a fibrous outer panel and a cast stone inner lining or tile having a hollow interior. The air which is trapped in the interior forms a dead air space which acts as a heat insulator. The making of the door of two parts,

each of different material and possessing different characteristics, enables one to select a material for the outer panel such as wood,'or fibrous board, which has a low conductivity of heat.

The core a is made of fibre board or other light material, although I preferably use a fibrou material since this may be readily handled, is relatively light in weight, and the cost is low. The reinforcing frame is made preferably of metal to provide sufficient rigidity to the mechanical union between the two parts of the door. The cement whichfiows through the large number of punched-out holes a in the reinforcing frame assures the adhesion of the cement with the reinforcing frame, as when the cement hardens the reinforcing frame will be securely anchored or keyed within the cement.

What I claim is:

1. In a door, the combination of an outer panel of aheat-insulating material, and a cast hollow tile lining of non-heat-insulating material cast united thereto.

2. In a door, the combination of an outer panel and a hollow cast stonetile lining cast thereto the major portion of said lining spaced from the outer panel to provide a dead air space.

3. In a door, the combination of an outer panel of one material, and a reinforced hollow cast tile lining united to the outer panel by means of the reinforcement.

4. In a door. the combination of an outer meagre panel of one material, a cast stone hollow tile lining therefor provided with a reinforcement, the reinforcement being mechanically secured to the outer panel and embedded in the hollow tile casting. I

5. In a door, the combination of an outer panel of one material and a hollow cast tile lining for the door of a different material cast with a reinforcing member keyed therc-- outer panel a slotted reinforcing frame 10. In a door the combination of a fibrous outer panel and a hollow stone work tile lining provided with a hollow core member cast onto the inner face of the outer panel.

11. In a door, the combination of an outer panel of a heat-insulating material, and a hollow tile lining cast onto the inner face of the door and provided with a paper.

board hollow core cast into the job.

12. In a door, the combination of an outer panel of heat-insulating material, and a hollow tile lining therefor cast onto the in- .ner face of the panel and provided with a silicated hollow paper board core cast into the job.

In testimony whereof I affix my signature.

LLOYD G. COPEMAN. 

